Height Profiles of Transpolor VLF/LF Signals.
Airborne trailing-wire antennas assume a nearly horizontal orientation during high-speed operations, causing most of the radiated energy to propagate in the transverse-electric (TE) mode. Such TE signals can be exploited for very-low frequency (VLF) and low-frequency (LF) air-to-air communications....
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| Format: | Text |
| Language: | English |
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1982
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| Online Access: | http://www.dtic.mil/docs/citations/ADA129201 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA129201 |
| Summary: | Airborne trailing-wire antennas assume a nearly horizontal orientation during high-speed operations, causing most of the radiated energy to propagate in the transverse-electric (TE) mode. Such TE signals can be exploited for very-low frequency (VLF) and low-frequency (LF) air-to-air communications. The Defense Nuclear Agency and the Rome Air Development Center plan to measure the excitation and transpolar propagation of VLF/LF signals under normal ionospheric conditions and during solar proton events (SPEs), which simulate aspects of certain nuclear environments. Measurements will also be made of transverse magnetic (TM) signals, in order to compare their behavior with that of the TE signals. The measurements will be made at altitudes between the ground and lower ionosphere with rocket-borne receivers, launched from Thule, Greenland. The report presents calculated TE and TM signals at Thule for the ground-based and airborne transmitters to be monitored. The results can be used to specify the required receiver sensitivity and to predict transpolar TE/TM link performance under diverse ionospheric conditions. |
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